#include"ChartView.h"
#include<QValueAxis>
#include<QLineSeries>

QVector<QPointF> vec;
//现程序未使用qchart 以下代码仅供参考
void ChartView::mousePressEvent(QMouseEvent *event)
{
    if (event->button() == Qt::LeftButton)
    {
        m_lastPoint = event->pos();
        m_isPress = true;
    }
    QChartView::mousePressEvent(event);

}

void ChartView::leaveEvent(QEvent *event)
{
    thepoint->setVisible(false);
    x_line->setVisible(false);
    y_line->setVisible(false);
    QChartView::leaveEvent(event);

}

void ChartView::mouseMoveEvent(QMouseEvent *event)
{
    if (!m_coordItem)
    {

        m_coordItem = new QGraphicsSimpleTextItem(this->chart());
        m_coordItem->setZValue(5);
        m_coordItem->setPos(100, 60);
        m_coordItem->show();

    }
    if(!serice){
        serice = (QLineSeries*)this->chart()->series().at(0);
        vec = serice->pointsVector();

    }
    if(!x_line){

        x_line = new QGraphicsLineItem(this->chart());

    }
    if(!y_line){

        y_line = new QGraphicsLineItem(this->chart());

    }
    if(!thepoint){

        thepoint = new QGraphicsEllipseItem(this->chart());
    }
    x_line->setPen(QPen(Qt::gray));
    y_line->setPen(QPen(Qt::gray));
    x_line->setLine(event->x(),0,event->x(),this->height());
    y_line->setLine(0,event->y(),this->width(),event->y());
    x_line->show();
    y_line->show();
    //十字定位线的实现

    const QPoint curPos = event->pos();
    QPointF curVal = this->chart()->mapToValue(QPointF(curPos));
    float str = QString::number(curVal.x(), 'f', 1).toFloat();

    QPointF thetest = this->chart()->mapToPosition(vec[str*10 +150],serice);
    //QString coordStr = QString("X = %1, Y = %2").arg(curVal.x()).arg(curVal.y());
    QString coordStr = QString("X = %1, Y = %2 x1 =%3 y1 = %4").arg(curVal.x()).arg(curVal.y()).arg(thetest.x()).arg(thetest.y());
    QLinearGradient gLg;
    gLg.setStart (-80,-60);
    gLg.setFinalStop (-20,40);
    gLg.setColorAt (0,qRgb (140,0,140));
    gLg.setColorAt (1,qRgb (140,0,140));
    QPen pen(qRgb (140,0,141));
    thepoint->setPen (pen);
    thepoint->setBrush (gLg);
    thepoint->setOpacity (0.9);
    thepoint->setRect(thetest.x()-5,thetest.y()-5,10,10);
    thepoint->show();
    m_coordItem->setText(coordStr);

    if (m_isPress)
    {
        QPoint offset = curPos - m_lastPoint;
        m_lastPoint = curPos;
        if (!m_alreadySaveRange)
        {
            this->saveAxisRange();
            m_alreadySaveRange = true;
        }
        this->chart()->scroll(-offset.x(), offset.y());
    }
    QChartView::mouseMoveEvent(event);
}

void ChartView::mouseReleaseEvent(QMouseEvent *event)
{
    m_isPress = false;

    QChartView::mouseReleaseEvent(event);
}

//保存原始位置
ChartView::ChartView(QWidget *parent)
{
    this->setParent(parent);
    //serice = (QLineSeries*)this->chart()->series().at(0);
    // vec = serice->pointsVector();
}

void ChartView::saveAxisRange()
{
    QValueAxis *axisX = dynamic_cast<QValueAxis*>(this->chart()->axisX());
    m_xMin = axisX->min();
    m_xMax = axisX->max();
    QValueAxis *axisY = dynamic_cast<QValueAxis*>(this->chart()->axisY());
    m_yMin = axisY->min();
    m_yMax = axisY->max();
}
void ChartView::wheelEvent(QWheelEvent *event)
{
    const QPoint curPos = event->pos();
    QPointF curVal = this->chart()->mapToValue(QPointF(curPos));

    if (!m_alreadySaveRange)
    {
        this->saveAxisRange();
        m_alreadySaveRange = true;
    }
    const double factor = 1.5;//缩放比例
    if (m_ctrlPress)
    {//Y轴
        QValueAxis *axisY = dynamic_cast<QValueAxis*>(this->chart()->axisY());
        const double yMin = axisY->min();
        const double yMax = axisY->max();
        const double yCentral = curVal.y();

        double bottomOffset;
        double topOffset;
        if (event->delta() > 0)
        {//放大
            bottomOffset = 1.0 / factor * (yCentral - yMin);
            topOffset = 1.0 / factor * (yMax - yCentral);
        }
        else
        {//缩小
            bottomOffset = 1.0 * factor * (yCentral - yMin);
            topOffset = 1.0 * factor * (yMax - yCentral);
        }

        this->chart()->axisY()->setRange(yCentral - bottomOffset, yCentral + topOffset);
    }
    else
    {//X轴
        QValueAxis *axisX = dynamic_cast<QValueAxis*>(this->chart()->axisX());
        const double xMin = axisX->min();
        const double xMax = axisX->max();
        const double xCentral = curVal.x();

        double leftOffset;
        double rightOffset;
        if (event->delta() > 0)
        {//放大
            leftOffset = 1.0 / factor * (xCentral - xMin);
            rightOffset = 1.0 / factor * (xMax - xCentral);
        }
        else
        {//缩小
            leftOffset = 1.0 * factor * (xCentral - xMin);
            rightOffset = 1.0 * factor * (xMax - xCentral);
        }
        this->chart()->axisX()->setRange(xCentral - leftOffset, xCentral + rightOffset);
    }
}
